[Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not part of C/C++ standard

[Markus Mützel]

Follow-up Comment #38, bug #61812 (project octave):

>From GCC's documentation:
https://gcc.gnu.org/onlinedocs/gcc/Standards.html
> By default, GCC also provides some additional extensions to the C++ language
that on rare occasions conflict with the C++ standard. See Options Controlling
C++ Dialect. Use of the -std options listed above disables these extensions
where they they conflict with the C++ standard version selected. You may also
select an extended version of the C++ language explicitly with -std=gnu++98
(for C++98 with GNU extensions), or -std=gnu++11 (for C++11 with GNU
extensions), or -std=gnu++14 (for C++14 with GNU extensions), or -std=gnu++17
(for C++17 with GNU extensions), or -std=gnu++20 (for C++20 with GNU
extensions).
>
> The default, if no C++ language dialect options are given, is -std=gnu++17.

So, I would have thought no flags would be necessary to get the full set of
features for C++11 *with* GNU extensions with a modern GCC.
For some reason, the macro determines that it *does* need setting -std=gnu++11
to get what is requested...

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